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K&N 57 Series FIPK Air Intake (50-State Legal) Part #57-2551 Customer Reviews
7 Customer Reviews
Reviewed by christian c (spring valley, CA) Reviewed for a 2003 Lincoln Navigator — Apr 15, 2013 10:25 PM
Reviewed by Bryce B (Henderson, NV) Reviewed for a 2004 Lincoln Navigator — Dec 29, 2008 9:50 AM
The intake installation instructions were lacking to say the least for my 2004 Navigator! K & N could have done way better job in describing what parts go together. You are left to figure out certain things on your own. The system works well is loud and gives better response. However, my miles per gallon have certainly dropped, which I hoped would not happen. Overall, it is a trade off of horsepower versus miles per gallon.
Reviewed by James B (Holladay, UT) Reviewed for a 2004 Lincoln Navigator — Feb 07, 2008 8:44 PM
This sounds awesome when you first start it up. Its a little louder when your driving and put your foot down. There is definitely more power around 2500-3500 rpms. I initially so about a 1-2 improvement in gas mileage, but now it hard to tell. We have had it installed for about 3 weeks. Removal of the factory system was some what of a pain. In step 6 & 8 it talks about two retaining grommets that you really have to pull hard to get them out. It holds the factory airbox to a mounting bracket that is bolted to the vehicle. Instruction say, "8. Remove the entire stock air intake assembly from the vehicle." I had to pull so hard that I thought I was going to break something. Look at the picture in step 9 to see the two holes that the grommets are anchored into. Step 11 is a little difficult because you can't really see what your trying to do. The idea is that you are releasing a little tab. Don't stick the screwdriver into the tiny slit, use the screwdriver to push a release, toward the cables. The edge trim that was shipped was not long enought to go all the way around the heat shield. The next difficult step was 20, "Install the air temp sensor into the grommet as shown." The hard part is that the grommet would push into the intake tube and not seal the air temp sensor, so be careful to hold it from slipping inside the tube as up push the sensor in. Overall it wasn't too bad. It took about 2 hrs from start to finish. I am really impressed with this system. So much that I bought two other systems, one for another Navigator and one for an F150. I'll post my reviews on those separately. Good luck and happy driving!